长清M4.1地震前区域小震调制比异常分析  

Analysis of Regional Small Earthquake Modulation Ratio Anomalies before Changqing M4.1 Earthquake

作　　者：林眉[1] 郑建常[1] LIN Mei;ZHENG Jianchang(Shandong Earthquake Agency,Ji’nan 250014,China)

机构地区：[1]山东省地震局,济南市250014

出　　处：《大地测量与地球动力学》2021年第11期1207-1210,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局震情跟踪定向工作任务(2021020501)。

摘　　要：研究山东内陆地区2008年以来1级以上小震的月相调制效应,并结合地震b值变化进行分析。结果表明,2020-02-18长清M4.1地震前该区存在低b值、高调制比异常,计算综合节面解P轴方位偏转发现,其与小震b值的低值变化时段非常一致。研究区6次4级以上地震前,有4次出现异常,调制比≥0.33;而2011年和2016年2次范县地震前未出现异常,可能与范县小震集中区受采油作用影响有关。We study the moon phase modulation effect of small earthquakes above M1 in Shandong inland area since 2008, combining with the variation of seismic b value in this area. The results show that there are anomalies of low b value and high modulation ratio in the area before the 2020-02-18 Changqing M4.1 earthquake, and we calculate the deflection phenomenon of P-axis of the composite nodal plane solution, which is very consistent with the variation period of low b value of small earthquakes. In addition, before the 6 earthquakes above M4 in this area, the abnormality of modulation ratio ≥0.33 occurs 4 times. In 2011 and 2016, the two Fanxian earthquakes did not show the above changes, which may be related to the activity mechanism of oil recovery in Fanxian small earthquake concentration area.

关 键 词：调制比 引潮力 月相 

分 类 号：P315[天文地球—地震学]